Perspective on the phase diagram of cuprate high-temperature superconductors.
Perspective on the phase diagram of cuprate high-temperature superconductors.
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DOI：
10.1038/ncomms11413
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发表时间：
2016-05-06
影响因子：
16.6
通讯作者：
Haase J
中科院分区：
文献类型：
--
作者：
Rybicki D;Jurkutat M;Reichardt S;Kapusta C;Haase J
普遍标度定律可以指导对新现象的理解，对于铜的高温超导，很早就有影响的植村关系表明，超导的最高临界温度与在低温下测量的超流体密度有关。在这里，我们证明了在普遍存在的CuO2平面上，用核磁共振测量的铜和氧的成键轨道的电荷含量再现了这种缩放。标称铜孔向平面氧的电荷转移设定了最高临界温度。介绍了铜和氧电荷含量的三维相图，根据铜的最高临界温度对不同的铜族进行了分类。我们建议，如果能够合成以平面铜为代价增加平面氧空穴含量的材料，则临界温度可以大大提高。铜超导体的临界温度超过100k，低于此温度电流无电阻流动。在这里，作者展示了该温度是如何由材料化学设定的，从而重新解释了铜相图，并提出了未来如何提高该温度的建议。
Universal scaling laws can guide the understanding of new phenomena, and for cuprate high-temperature superconductivity the influential Uemura relation showed, early on, that the maximum critical temperature of superconductivity correlates with the density of the superfluid measured at low temperatures. Here we show that the charge content of the bonding orbitals of copper and oxygen in the ubiquitous CuO2 plane, measured with nuclear magnetic resonance, reproduces this scaling. The charge transfer of the nominal copper hole to planar oxygen sets the maximum critical temperature. A three-dimensional phase diagram in terms of the charge content at copper as well as oxygen is introduced, which has the different cuprate families sorted with respect to their maximum critical temperature. We suggest that the critical temperature could be raised substantially if one were able to synthesize materials that lead to an increased planar oxygen hole content at the expense of that of planar copper. Cuprate superconductors show critical temperatures over 100 K, below which current flows without resistance. Here, the authors show how this temperature is set by material chemistry, leading to a reinterpretation of the cuprate phase diagram and suggestions of how to raise this temperature in the future.